Mods to frame for tall tails as I see it. the mast should be 10" above the prop to get the 2" clearance between the rudder support and prop. rudder leading eage is 6" from prop, 12" drop cut out from the top rear of rudder to help clear blades.
I think (if I remember right) that Chuck Bs machine has the angle (down from horizontal) of 27 degrees to allow clearance from the rotor head to the tail. It's on Larry Goodhinds site. Please keep us apprised of your suspension design.
I saw that on Ron's gyro picture, the main wheels axels are drop too. About 3". other thing I imagine that you are goin to use brakes on the main wheels because now the front wheel you can't adapt the old brake.